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President Barack Obama (L) talks to television personality Stephen Colbert during a taping of Comedy Central's "The Colbert Report" in Lisner Auditorium at George Washington University on December 8, 2014 in Washington, DC. This is President Obama's third appearance on "The Colbert Report" that broadcasted its final show on Dec. 18. (Photo by Andrew Harrer-Pool/Getty Images) ( 82994568 )

U.S. President Barack Obama (L) talks to television personality Stephen Colbert during a taping of Comedy Central's "The Colbert Report" in Lisner Auditorium at George Washington University on December 8, 2014 in Washington, DC. This is President Obama's third appearance on "The Colbert Report" that broadcasted its final show on Dec. 18. (Photo by Andrew Harrer-Pool/Getty Images) ( 82995054 )

In this photo provided by NBC, Jimmy Fallon appears with Stephen Colbert, right, during his "The Tonight Show" debut on Monday, Feb. 17, 2014, in New York. Fallon departed from the network's “Late Night” on Feb. 7, 2014, after five years as host, and is now the host of “The Tonight Show,” replacing Jay Leno after 22 years. (AP Photo/NBC, Lloyd Bishop) ( TV Fallons First Night )

tephen Colbert and Mindy Kaling appear onstage at the Glamour 2014 Women Of The Year Awards at Carnegie Hall on November 10, 2014 in New York City. (Photo by Larry Busacca/Getty Images for Glamour) ( 522797215TK00095_Glamour_s_ )

In this image taken from video and released by World Wide Pants, Inc., host David Letterman, left, welcomes fellow talk show host Stephen Colbert, as Colbert made a surprise visit to the “Late Show with David Letterman,” Wednesday, May 4, 2011 in New York. The appearance will air Wednesday evening on both shows. (AP Photo/CBS) ( Late Show Stephen Colbert )

Comedian Stephen Colbert waits for an event in the East Room of the White House December 7, 2014 in Washington, DC. Obama and the first lady welcomed recipients of the 37th Annual Kennedy Center Honors to the White House to celebrate their contributions to the arts. (BRENDAN SMIALOWSKI/AFP/Getty Images) ( Was8887295 )

Political Satirist Stephen Colbert (L) and Chairman & CEO of FedEx Corp. Frederick Smith attend Ad Council's 61st Annual Public Service Award Dinner at The Waldorf=Astoria on November 19, 2014 in New York City. (Photo by Ben Gabbe/Getty Images) ( 523994201BG020_AD_COUNCIL_S )

Stephen Colbert arrives at the 65th Primetime Emmy Awards at Nokia Theatre on Sunday Sept. 22, 2013, in Los Angeles. (Photo by Dan Steinberg/Invision/AP) ( 65th Primetime Emmy Awards - Arrivals )

Stephen Colbert was a winner at the 65th Annual Emmy Awards. Los Angeles, CA. 9/22/2013. photo by (Michael Owen Baker/Los Angeles Daily News) ( Arrivals Emmys Red Carpet )

Political Satirist Stephen Colbert attends Ad Council's 61st Annual Public Service Award Dinner at The Waldorf=Astoria on November 19, 2014 in New York City. (Photo by Ben Gabbe/Getty Images) ( 523994201BG004_AD_COUNCIL_S )

Sculpted clay-head mold of Comedy Central host, Stephen Colbert, in photo unveiled by Madame Tussauds Washington D.C. on November 12 to announce the creation of his wax figure. Colbert will visit the attraction on Friday, November 16 to help unveil his incredibly lifelike wax figure. (PRNewsFoto/Madame Tussauds Washington D.C.) ( MADAME TUSSAUDS WASHINGTON D.C. STEPHEN COLBERT )

Stephen Colbert is supported by audience members while standing inside a large inflatable bubble during the finale of StePhest Colbchella '012 Rocktaugustfest at the Intrepid Sea, Air & Space Museum, Friday, Aug. 10, 2012, in New York. (Photo by Jason DeCrow/Invision/AP) ( StePhest Colbchella 012 Rocktaugustfest )

In this May 21, 2012 file photo, TV personality and author Stephen Colbert attends the 71st Annual Peabody Awards in New York. Colbert, host of "The Colbert Report," on Comedy Central, will be a guest host on "Good Morning America" for Robin Roberts, who is scheduled to undergo a bone marrow transplant this week. (AP Photo/Charles Sykes, file) ( TV-ABC-Morning Subs )

Stephen Colbert was a winner at the 65th Annual Emmy Awards. Los Angeles, CA. 9/22/2013. photo by (Michael Owen Baker/Los Angeles Daily News) ( Arrivals Emmys Red Carpet )

In this Oct. 13, 2013 file photo, Stephen Colbert delivers the keynote address during the Alfred E. Smith Memorial Foundation Dinner, a charity gala organized by the Archdiocese of New York, at the Waldorf-Astoria hotel in New York. Comedy Central deleted a message Thursday, March 27, 2014, from its "Colbert Report" Twitter feed showing a still from Wednesday night's show where Stephen Colbert joked about starting a "Ching-Chong Ding-Dong Foundation for Sensitivity to Orientals or Whatever." The joke was part of a skit in which Colbert talked about the Washington Redskins' owner buying things for Native Americans upset with the team's name.(AP Photo/Jason DeCrow, file) ( TV-Colbert Tweets )

Comedian Stephen Colbert and wife, Evelyn Colbert, arrive at the State Department for the Kennedy Center Honors Gala Dinner on Saturday, Dec. 1, 2012 in Washington. (AP Photo/Kevin Wolf) ( Kennedy Center Honors 2012 )

Stephen Colbert Makes Super Bowl Debut with Wonderful Pistachios. Wonderful Pistachios Returns to the Super Bowl with Two New Spots, New Campaign Theme, "Get Crackin', America." For more information visit GetCrackin.com.(PRNewsFoto/Wonderful Pistachios) ( WONDERFUL PISTACHIOS STEPHEN COLBERT )

Stephen Colbert and Evie Colbert, arrive for a State Dinner in honor of French President François Hollande, at the White House in Washington, Tuesday, Feb. 11, 2014. (AP Photo/Manuel Balce Ceneta) ( US France State Dinner )

Stephen Colbert, arrive for a State Dinner in honor of French President François Hollande, at the White House in Washington, Tuesday, Feb. 11, 2014. (AP Photo/Manuel Balce Ceneta) ( US France State Dinner )

This image released by Disney ABC Television Group shows host Jimmy Kimmel, right, with guests, Stephen Colbert, from "The Colbert Report," left, and Jon Stewart from "The Daily Show with Jon Stewart," during the "Jimmy Kimmell Live" show, Thursday, Nov. 1, 2012 in New York. (AP Photo/Disney ABC Television Group, Jeff Neira) ( TV Jimmy Kimmell )

LOS ANGELES, CA - SEPTEMBER 23: Stephen Colbert (R) presents the Outstanding Lead Actress In A Comedy Series award to Julia Louis-Dreyfus for 'Veep' onstage at the Academy of Television Arts & Sciences 64th Primetime Emmy Awards at Nokia Theatre L.A. Live on September 23, 2012 in Los Angeles, California. (Photo by Phil McCarten/Invision for the Academy of Television Arts & Sciences/AP Images) ( 64th Primetime Emmy Awards - Show )

This Sept. 18, 2011 file photo shows Stephen Colbert at the 63rd Primetime Emmy Awards Governors Ball in Los Angeles. Colbert is hosting another music extravaganza, and this time, he's got missiles. The comedian announced Tuesday, July 31, 2012, on “The Colbert Report” that he will host a concert on Aug. 10 aboard the Intrepid Sea, Air and Space Museum in New York. (AP Photo/Chris Pizzello, file) ( TV-Colbert Concert )

Comedian Stephen Colbert appears before the Federal Election Commision in Washington, Thursday, June 30, 2011. The FEC granted Colbert's request to form a Polical Action Committee. (AP Photo/Cliff Owen) ( COLBERT PAC )

Comedian Stephen Colbert, host of the Colbert Report, arrives on Capitol Hill in Washington, Friday, Sept. 24, 2010, to testify before the House Immigration, Citizenship, Refugees, Border Security and International Law subcommittee hearing on Protecting America's Harvest. (AP Photo/Alex Brandon) ( Colbert Congress )

Comedian Stephen Colbert, left, leaps to high-five basketball great Kareem Abdul Jabbar as he and comedian Jon Stewart, right, perform during their Rally to Restore Sanity and/or Fear on the National Mall in Washington, Saturday, Oct. 30, 2010. (AP Photo/Carolyn Kaster) ( Stewart-Colbert Rally )

The June 15 issue of Newsweek (on newsstands June 8), "Iraq," features the first ever guest editor, Stephen Colbert. Top of the Week, Letters, Conventional Wisdom and more are written by Colbert. Plus, the way we view Iraq now, why some soldiers seek out combat, inside the mind of West Point's class of 2009, children of military parents, our real prison problem, and what Pittsburgh can teach Obama. (PRNewsFoto/NEWSWEEK) ( NEWSWEEK JUNE 15 COVER )

Stephen Colbert and Kanye West attend the Comedy Central Emmy After Party Sunday, Sept. 21, 2008 in Los Angeles, California. (AP Photo/Shea Walsh) ( Comedy Central Emmy After Party )

Comedian Stephen Colbert during "The New York Friars Club Roast of Chevy Chase" presented by Comedy Central at the New York Hilton in New York City, September 28, 2002. Photo by Frank Micelotta/ImageDirect. ( id_chase_{seqn} )

Correspondent Steve Colbert appears during live Election Night coverage of The Daily Show with Jon Stewart November 2, 2004 in New York City. (Photo by Frank Micelotta/Getty Images) ( 51630399FM025_Jon_Stewart_L )

Actor Steven Colbert of the film "Strangers with Candy" poses for portraits during the 2005 Sundance Film Festival January 24, 2005 in Park City, Utah. (Photo by Carlo Allegri/Getty Images) ( 52055231CA351_candy )

Stephen Colbert one of the honored artists receives an award for unique contributions at the Symphony Space's annual Spring Gala with a silent auction and a program of micro-fictions and music at the Lighthouse at Chelsea Piers, on April 25, 2005 in New York City. (Photo by Desiree Navarro/Getty Images) ( 52684310DN008_SYMPH )

'The Daily Show With Jon Stewart' correspondent Stephen Colbert (L) and Executive Vice President and General Manager of Comedy Central Michele Ganeless attend the Comedy Central Emmy after party held at Meson G on September 18, 2005 in Los Angeles, California. (Photo by Ethan Miller/Getty Images) ( Comedy Central Emmy Party - Inside )

Steve Carell, left, and Stephen Colbert pretend to accept the outstanding lead actor in a comedy series which actually was won by Ricky Gervais for his work on "Extras" at the 59th Primetime Emmy Awards Sunday, Sept. 16, 2007, at the Shrine Auditorium in Los Angeles. Gervais was not present to accept the award. (AP Photo/Mark J. Terrill) ( Emmys Show )

Stephen Colbert arrives for the 60th Primetime Emmy Awards with his wife, Evelyn, left, and daughter Madeline, Sunday, Sept. 21, 2008, at the Nokia Theatre in Los Angeles. Colbert is nominated for outstanding individual performance in a variety or music program for his work on "The Colbert Report." (AP Photo/Chris Pizzello) ( Emmy Awards Arrivals )

Stephen Colbert and his wife Evelyn McGee arrive at the 61st Primetime Emmy Awards on Sunday, Sept. 20, 2009, in Los Angeles. (AP Photo/Matt Sayles) ( Primetime Emmy Awards Arrivals )

Comedian Stephen Colbert, center, reacts as he talks to US speed skater Mitchell Whitmore, left, prior to the men's 1,000 meter speed skating race at the Richmond Olympic Oval at the Vancouver 2010 Olympics in Vancouver, British Columbia, Wednesday, Feb. 17, 2010. Faux talk show host and speedskating patron Stephen Colbert made his debut at the Vancouver Games on Thursday, taping segments for his show "The Colbert Report". (AP Photo/Peter Dejong) ( Vancouver Olympics Speed Skating )

Stephen Colbert rides an Army ASV while taping an episode of the Colbert Report on West 54th Street in New York, Wednesday, September 8, 2010. (AP Photo/Charles Sykes) ( Colbert Report Taping )

Stephen Colbert and Steve Carell appear on stage at Comedy Central's 'Night Of Too Many Stars: An Overbooked Concert For Autism Education' at the Beacon Theatre in New York, Saturday, October 2, 2010. (AP Photo/Charles Sykes) ( Comedy Centrals 'Night Of Too Many Stars' )

Stephen Colbert and Steve Carell appear on stage at Comedy Central's 'Night Of Too Many Stars: An Overbooked Concert For Autism Education' at the Beacon Theatre in New York, Saturday, October 2, 2010. (AP Photo/Charles Sykes) ( Comedy Centrals 'Night Of Too Many Stars' )

TV personality Stephen Colbert and Evelyn McGee-Colbert attend the first annual "The Comedy Awards", honoring and celebrating the world of comedy, in New York, on Saturday, March 26, 2011. (AP Photo/Peter Kramer) ( The Comedy Awards Arrivals )

Stephen Colbert, left, and Jack White sign copies of their vinyl record, "Charlene II (I'm Over You)," in New York, Friday, June 24, 2011. (AP Photo/Charles Sykes) ( TV-Colbert-White )

Television personality Stephen Colbert and wife Evelyn attend the TIME 100 gala, celebrating the 100 most influential people in the world, at the Frederick P. Rose Hall on Tuesday, April 24, 2012 in New York. (AP Photo/Evan Agostini) ( TIME 100 Gala )

Stephen Colbert during the 64th Primetime Emmy Awards at Nokia Theatre L.A. Live on September 23, 2012 in Los Angeles, California.(David Crane/Los Angeles Daily News) ( DN24-EMMY-SHO-012DC )

Former President Bill Clinton and Comedy Central's Stephen Colbert, right, shake hands before an interview during the Clinton Global Initiative at Washington University Saturday, April 6, 2013, in St. Louis. More than 1,000 university students from 75 countries and all 50 states were gathered for a weekend of sessions seeking practical and innovative solutions to the world's problems. (AP Photo/Jeff Roberson) ( Missouri Clinton Conference )

Jim Parson, Bob Newhart, and Stephen Colbert during the 65th Primetime Emmy Awards at the Nokia Theatre in Los Angeles, California on Sunday Sept. 22, 2013 (Photo by Andy Holzman / Los Angeles Daily News) ( 65th Primetime Emmy Awards )